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Histopathology of Anticarsia Gemmatalis Hübner (Lepidoptera; Noctuidae) Treated with Nucleopolyhedrovirus and Bacillus Thuringiensis Serovar Kurstaki

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Histopathology of Anticarsia Gemmatalis Hübner (Lepidoptera; Noctuidae) Treated with Nucleopolyhedrovirus and Bacillus Thuringiensis Serovar Kurstaki Brazilian Journal of Microbiology (2005) 36:196-200 ISSN 1517-8382 HISTOPATHOLOGY OF ANTICARSIA GEMMATALIS HÜBNER (LEPIDOPTERA; NOCTUIDAE) TREATED WITH NUCLEOPOLYHEDROVIRUS AND BACILLUS THURINGIENSIS SEROVAR KURSTAKI Neiva Knaak*; Lidia Mariana Fiuza* Laboratório de Microbiologia, Universidade do Vale do Rio dos Sinos, São Leopoldo, RS, Brasil Submitted: December 17, 2002; Returned to authors for corrections: June 03, 2004; Approved: May 27, 2005 ABSTRACT The Anticarsia gemmatalis is responsible for the use of chemical insecticides in the soybean culture, causing a significant increase in the costs of farming and a great unbalance in the ecosystem. The use of microbial agents, like Bacillus thuringiensis serovar kurstaki (Btk) and Anticarsia gemmatalis nucleopolyhedrovirus (AgNPV), they are an alternative to chemical control of the pest insects. In the interaction analysis of the entomopathogenic bacteria and virus it is considered important the in vitro action mode of these microbiology control agents. Therefore, the present study aims the histopathological analysis of the A. gemmatalis larvae digestive system after the interaction in vivo of the entomopathogenic Btk and AgNPV, represented the Dipel and Baculovirus anticarsia formulations, respectively. The evaluations were realized in larvae of 2nd instar, in which the mortality was evaluated daily, and a histopathology was done with collected larvae in time of 1, 3, 6, 12 and 24 hours after the treatments application. The results of the in vivo assays reveal that the treatment using the association of AgNPV-Btk (98.68% of mortality) was more efficient than using AgNPV isolatedly (81.28% of mortality), but the Btk when used isolatedly had a mortality of 100%. The treatments showed significant (P<0.05) differences between AgNPV and Btk, AgNPV and AgNPV/Btk. The histopathological analysis of the AgNPV and Btk in A. gemmatalis larvae suggests that the Dipel and Baculovirus anticarsia products were more efficient when they were used simultaneously, because the action of AgNPV was intensified when used in association with Btk, causing changes in the larvae midgut after 6 hours of treatments. When the entomopathogens were used isolating the gut cells alterations were observed only 12 hours after the treatments. Key words: virus, bacteria, biological control, Lepidoptera INTRODUCTION aerobic or facultative anaerobic entomopathogenic bacterium found in soil, on plant surfaces, and in grain storage dust. During The velvetbean caterpillar Anticarsia gemmatalis Hübner sporulation B. thuringiensis produce crystalline protein (Lepidoptera: Noctuidae) is an important insect pest of the inclusions (i.e. crystal). When ingested by insects, this crystal is soybean fields in Brazil. The larva cause serious damage by dissolved in the midgut, discharging proteins denominated delta- reducing the leaf area greatly and, consequently, reducing endotoxins or Cry proteins. Those proteins after hydrolysis have photosynthesis and productivity (18). specific toxin activity for insects and other invertebrate, not Among the alternatives to control this pest, the use of Bacillus causing harmful effects in other organism (25). In the midgut, the thuringiensis has gained attention due to its efficiency and low proteases activate these proteins that interact with the epithelial impact on natural enemies (3). B. thuringiensis is a Gram-positive, membrane, causing the insect death (6). In the field, as in the *Corresponding Author. Mailing address: Laboratório de Microbiologia, Universidade do Vale do Rio dos Sinos, Av. Unisinos, 950. 93001-970, São Leopoldo, RS, Brasil. Fax: (+5551) 591-1100, E-mail: [email protected]; [email protected] 196 Histopathology of A. gemmatalis soybean farming’s that agent of biological insects control is used mL; for AgNPV and 2.5.107 cells/mL; for Btk) dilutions were in formulations as the Dipel product (Abbott Laboratories of made and the exact number of bacterial cells and viral Brasil Ltda). polyhedrons were determined in Neubauer chamber. After the In the microbial control context, the Anticarsia gemmatalis treatments application, 20 insects were individually nucleopolyhedrovirus (AgNPV) stands out as the most conditioned, in which four repetitions were accomplished by important virus used in the insects biological control (5). In treatment. The mortality was daily evaluated until the 7th day natural conditions, the curse is infected commonly when after the treatments application and the corrected mortality ingesting the contaminated food. After the ingestion, the bodies was calculated according to Abbott (1). Data were subjected of polyhedral inclusion, finding alkaline conditions in the either to one-way analysis of variance (ANOVA), TUKEY 5% mesenterum are dissolved, liberating the virions. The virus and factorial analysis of variance (FANOVA) depending upon begins multiplying itself in the nucleus cells of the insect, the experimental design. dispersing itself for the whole insect body, provoking death, usually from 6 to 8 days after the ingestion (12,24). Insects’ tissues To understand the mode action of entomopathogenic The A. gemmatalis larva were prepared according to the bacteria and virus, it is important to knowledge of the insect inclusion paraffin techniques. During the bioassay, 20 larvae histopatology. The insect digestive system’s is one main were used for each treatment and 20 to witness, in which they physiochemical barriers against the pathogenic agents. In this were collected in periods of 1, 3, 6, 12 and 24 hours, after the way, the morphology and physiochemical aspects can support treatments application. After the fixation, in Bouin Hollande to understand of the insect defense mechanism’s (16). Sublime (BHS) for 24 hours (7), the tissues were submitted to Like this, the present study aimed the histopathological dehydration in ethanol solutions in growing order of graduation analysis of the A. gemmatalis larvae digestive system, after the (70, 96 and 100%), following by fast baths of xylol and interaction in vivo of the entomopathogenic Bacillus impregnation in paraffin. The longitudinal histological cuts were thuringiensis kurstaki and Anticarsia gemmatalis accomplished to 5µm thickness, in the histology laboratory nucleopolyhedrovirus, representing the formulations Dipel (UNISINOS). To remove the paraffin, the slide containing the (Abbott) and Baculovirus anticarsia (Embrapa-CNPSo), tissue passed by xylol and ethanol baths in decreasing order of respectively. graduation. The staining, of the tissues of A. gemmatalis was made with Heidenhain’s Blue. The glasses were mounted with MATERIALS AND METHODS Etellan. The longitudinal sections of the gut tissues of the A. gemmatalis larvae were observed under direct optical Insects microscopy were amplified 400 times. The Anticarsia gemmatalis were obtained from soybean fields in the Rio Grande do Sul state and maintained in RESULTS AND DISCUSSION laboratory in the Ciências da Saúde of the Universidade do Vale do Rio dos Sinos (UNISINOS). The insects were maintained Pathogenicity in vivo in the laboratory at 70% relative humidity, photoperiod of 12 The evaluations of the pathogenicity were considering hours and 25ºC. Larvae were reared with artificial diet prepared the Anticarsia gemmatalis corrected mortality medium, in according to Greene et al. (14). which the treatment with Anticarsia gemmatalis nucleopolyhedrovirus (AgNPV) was verified a mortality of Bioassay 81.28%, in the association Btk/AgNPV, the mortality was The bioassays were accomplished in the same laboratory 98.68% and only Bacillus thuringiensis serovar kurstaki (Btk) and on controlled conditions (25ºC, 70% of Relative humidity was equivalent to 100%. The results, in vivo, reveal that and 12 hours of photoperiod), using larvae of 2nd instar of A. regarding association treatment AgNPV/Btk was more efficient gemmatalis, conditioned in acrylic mini-plates (35mm of than only AgNPV, however only Btk caused a similar mortality. diameter), in which was previously applied Greene’s diet (14). The in vivo toxicity obtained in this study using 2.5.107 cells/ In assays were used in the treatments Anticarsia gemmatalis mL of the Btk HD1 against the target species was similar to nucleopolyhedrovirus (AgNPV) and Bacillus thuringiensis those obtained by Bobrowski et al. (8 and 9) using Btk HD73 serovar kurstaki (Btk), strain HD1. The products were obtained and Btk UNI872 strains. from A. gemmatalis Baculovirus (EMBRAPA/CNPSo) and Dipel Considering the lethal time, through the daily analysis of (Abbott Laboratories of Brazil Ltda.), respectively. Were applied the bioassay, it was observed that the treatment with Btk on the in the artificial diet the treatments Btk; AgNPV; Btk + AgNPV 3rd day after the treatment (DAT) caused 96.05% of mortality, and witness (100 µL of NaCl 0.85% solution). Considering the keeping like this until 7th DAT. As for the treatment with AgNPV, treatments, to reach the wanted concentration (3.107 particles/ in 3rd DAT there was a mortality of 25% that raised itself to 197 N. Knaak and L.M. Fiuza 61.05% in 7th DAT. In the association Btk/AgNPV, the mortality observed the desruption of microvilli and a part of the cells was of 45% in 2nd DAT, with a peak of 85% in 3rd DAT, causing was already disorganized and lysed. Bacillus thuringiensis 90.26% of mortality in 7th DAT (Fig. 1). The treatments showed toxins thus appear to bind specifically on the apical membrane significant (P<0.05) differences in AgNPV and Btk, AgNPV and of the Lymantria
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